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APY calculator

Convert a nominal interest rate into annual percentage yield (APY) with compounding.

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The APY calculator turns Nominal rate (%), Compounding into APY, instantly and for free. For instance, with Nominal rate (%) = 5 and Compounding = Yearly it returns APY = 5%.

How to use it

  1. Enter your values: Nominal rate (%), Compounding.
  2. Read the result instantly: APY.

Frequently asked questions

What does the APY calculator actually compute?

It takes Nominal rate (%) and Compounding and derives APY from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Nominal rate (%) and Compounding. Nothing else is required — no account, no file upload.

Can you show a worked example?

With Nominal rate (%) = 5 and Compounding = Yearly, the calculator returns APY = 5%. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Nominal rate (%) = 5.5 and Compounding = Half-yearly instead, APY goes from 5% to 5.58% — which is why it is worth testing a few scenarios rather than trusting a single figure.

Which “Compounding” option should I choose?

You can pick between « Yearly », « Half-yearly », « Quarterly », « Monthly » and « Daily ». Each one changes what the calculator works out, so switch and compare — the default is « Yearly ».

What does it give for smaller values?

Scaled down to Nominal rate (%) = 4.5 and Compounding = Yearly, APY comes out at 4.5%. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Planning a deposit, a safety net or a large purchase: how much to put aside each month, and how long a target takes at a given rate.

What is the most common mistake?

Reading a nominal rate as if it were real. Inflation is subtracted from the return, not from the capital, so a 3% account during 4% inflation loses purchasing power every year.

How accurate is it, and what are the limits?

Estimate only — not financial advice.

What is the difference between the APY calculator and the Yield farming APY calculator?

This one returns APY; the Yield farming APY calculator returns Real APY and Final value. That is the whole difference — open the one whose figure you need.

Further reading

All guides →
ComparisonAPR vs APY: What's the Difference?APR and APY both describe a yearly rate, but only APY includes compounding. Here's what each means and which one actually matters for savings and loans.GuideWhat a Deposit Ladder Actually Costs: $141.92 Over Five YearsSplit $50,000 into five rungs instead of one five-year deposit and you end year five with $61,573.20 instead of $61,715.12. The whole liquidity option costs $141.92, once, during the ramp — and it is worth $1,049.24 if rates rise a point.ExplainerHow Inflation Eats Your SavingsInflation quietly cuts what your money can buy. Here's what it is, how it erodes cash, the rule of 72 for prices, and how to protect your savings.ExplainerCompounding Frequency, and Where Continuous Compounding Comes From(1 + r/n)^n rises with n but converges on e^r. At 6 percent, monthly and continuous compounding differ by $1.59 on $10,000 over a year. At 24 percent the same gap is $30.07, and over thirty years it is 7.4 percent of the balance.ExplainerWhat Is CAGR (and How to Use It)?CAGR turns an investment's whole journey into one steady yearly rate. Here's what it means, the formula, why it's useful for comparing, and what it hides.ExplainerThree Different Rules Get Called "The 529 Rule"Qualified expenses, the K-12 cap and state tax treatment are three separate rules, and only the first two are federal. The K-12 cap doubled to 20,000 dollars for tax years from 2026; a federally qualified withdrawal can still be a state recapture event.